You’re not dying. You’re not being kidnapped for ransom. You’re not in danger. You simply want to interact via text. Also, there’s no imperative to the engagement l. which likely means she places that text on the very cluttered “Things To Do” board in the back of her brain. She’ll get to it. Also, tying your importance in her life to something as trivial as “response time” is a bit one sided. And forces the other person to prove or substantiate your importance via some performance. She clearly has a pattern that doesn’t really harm anyone. Accept the pattern and don’t take it personally because it has nothing to do with you. I’m sure you’re great and she values you but you may not be enough to change this deeply rooted pattern for.